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84=5x+9
We move all terms to the left:
84-(5x+9)=0
We get rid of parentheses
-5x-9+84=0
We add all the numbers together, and all the variables
-5x+75=0
We move all terms containing x to the left, all other terms to the right
-5x=-75
x=-75/-5
x=+15
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